Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Patent
1996-09-10
1998-04-07
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
F16J 1516
Patent
active
057355312
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an arrangement for sealing a gap between two mutually concentric machine parts which move relatively to each other, a first machine part having a groove and a second machine part having a smooth seating surface facing the groove, whereby a sealing ring made from a rubber elastic material can be placed into the groove, and the sealing ring can be deflected towards a radially directed surface of the groove under the application of fluid pressure, whereby, when the pressure is reduced, the pressure dependent deflection of the sealing ring is automatically reduced towards the original position of the sealing ring in the pressureless state, whereby the sealing ring exhibits spreadable shoulders facing the bottom of the groove which form a region of static sealing and a closed ring shaped volume which is defined by the groove bottom, whereby the sealing ring is prebiased via lines of intersection of the shoulders seated on the bottom of the groove and a sealing ring surface forms a region of dynamic sealing which can be pressure relieved in proportion to the applied fluid pressure, whereby the cross section of the sealing ring has a pressure resistant body geometry in the vicinity of the dynamic seal and a body geometry in the vicinity of the static seal which can be substantially changed by pressure.
An arrangement of this type for sealing a gap is known in the art through DE-OS 14 75 603.
The conventional seal seats in its installed state with one sealing surface on a seating surface of the one machine part and with spreadable legs on the groove bottom of a second machine part. The sealing ring exhibits a certain prebias in the installed state. The cross sectional geometry of the sealing ring is configured in such a manner that both the low pressure and the high pressure sides of the sealing ring are parallel to the sides of the groove. When fluid pressure is applied, the sealing ring is deflected towards the low pressure side of the groove and seats over an area of the groove side. When additional fluid pressure is applied, the sealing ring is deformed in such a manner as to seat over an area of the low pressure side of the groove and on the groove bottom. The conventional sealing ring reacts to the application of fluid pressure with increasing material deformation. As a result, the life-time of the sealing ring is reduced as is the operating time of the sealing arrangement.
In the conventional sealing arrangement of DE-OS 21 04 859 a sealing ring seats in the installed state with a certain prebias with a sealing edge on a seating surface of the one machine part at the bottom of a ring-shaped groove of the other machine part. The cross sectional form of the conventional sealing ring has a section facing the bottom of the groove and a section facing the sealing surface which are connected to each other via a flexible middle strut. Both sections of the cross sectional form of the sealing ring are made from solid bodies. For this reason the prebiasing of the sealing ring cannot be reduced via the section seating on the bottom of the groove, i.e. in the vicinity of a static seal. Increased application of pressure therefore leads to an increase in the radial pressure component on the sealing edge so that the pressure load of the conventional sealing ring at the sealing edge increases in proportion to the applied pressure. For this reason the application of high pressures to the conventional sealing ring is not possible.
A sealing arrangement for two machine components which move relative to each other and have a deflectable sealing ring has become known in the art through DE GM 18 71 830. This conventional sealing ring is pushed onto the low pressure side of the groove under the application of pressure. Due to the cross sectional shape of the sealing ring, which is a solid body having concave shaped side surfaces, the sealing ring is pressed into the groove under the application of pressure. The pressing of the sealing ring leads to an increase in the radial comp
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Beres John L.
Busak & Shamban GmbH & Co.
Cuchlinski Jr. William A.
Hackler Walter A.
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